I like to think of 2-way looking as total seeing, seeing the seer and the scene. Looking seems to imply directing your attention, but it seems to me more like being aware of all that is presented at the moment. It's more like not looking, not directing your attention either inward or outward. Usually we're focused on things outside, what we're doing. Total seeing feels more like relaxing into what is, all of what is, which includes the void or the seer. It's more like unfocusing, relaxing, letting go. Relax and there it is.
This may not be helpful to you. It may just be a way that works for me. If it makes any sense to you, you could give it a try.Another way that brings me to total seeing is to realize (see) that when I am talking to someone that we are trading faces. I am immediately aware that here where they see my face, I see emptiness and light, the light that includes the (always interesting) face I see. Their face points to my emptiness, all here and now, instantly. And there's no deliberate looking involved. It's just total seeing or awareness of all that's given in the moment. J.C.